package com.huangliusong.desigin.principle.singleresponsbility;

/**
 * @author huangliusong
 * @since 2018/10/9
 * {@link }
 */
public class CourseImpl implements ICourseConteng,ICourseManager{
    public String getCourseName() {
        return null;
    }

    public byte[] getCourseVideo() {
        return new byte[0];
    }

    public void studyCourse() {

    }

    public void refundCourse() {

    }
}
